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To determine the co-efficient of absolute expansion of mercury. Glass tubes with vertical limbs contained within glass jackets approx. 460 x 25 mm height x diameter, are closed by bungs and fitted with inlet and outlet tubes. Upper ends of these vertical limbs are angled on emergence from the jackets to produce two short, adjacent limbs placed against a silvered glass scale 0 to 12 cm x 1 mm. Mounted on stand 610 x 230 mm, height x width. Overall height 750 mm approx., supplied without mercury.

To determine co-efficient of expansion of a gas at constant pressure. A glass U-tube with a bulb and stopcock at one end, the other limb being open. An outlet tube from the bottom of the U tube passes through a rubber bung and has a stopcock at the end. The stem below the bulb is graduated 3 x 0.1 ml. An inlet tube with a mohr clip also passes through the bung. A glass water jacket encloses the U tube. All glass parts made of borosilicate glass requires only 20 ml mercury, which is not included.

The Complete Optical Bench Set is an economical alternative to conventional optical benches that provides accurate demonstrations of basic optics principles. The complete system includes: 1. Optical bench-double-sided meter stick. 2. One Object and Marker. 3. One Screen support. 4. One Candle holder. 5. One Pair of metal supports. 6. Two Lens supports— 4 cm and 7.5 cm. 7. Five White board screens, each 10 x 12.5 cm with a millimeter scale along one side. 8. 12 paraffin candles.